JP3676208B2 - Solid-liquid separation tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, sludge concentration tank for sedimentation tank and sludge treatment for activated sludge treatment, gravity settling separator of fine particles, the solid applicable to the separation process in general aqueous phase and a solid phase, such as coagulating sedimentation treatment tank The present invention relates to a liquid separation tank .
[0002]
[Prior art]
A dilute suspension containing fine particle groups (suspended substance: SS) is used as inflow raw water, and no chemicals are added as a device that continuously purifies large volumes of inflow raw water by separating and concentrating the fine particle groups. There are solid-liquid separation devices that perform natural sedimentation separation, filtration separation, etc. under the above conditions, but all have problems such as slow solid-liquid separation speed and inability to respond to fluctuations in raw water inflow and water quality. As a countermeasure, there was a problem that the apparatus had to be made large.
[0003]
Therefore, as a treatment device that can cope with fluctuations in raw water inflow and water quality to some extent, a swirl tank that swirls inflow raw water in the tank and separates fine particles in the raw water by inertial force using the swirl flow. Applying is already known.
[0004]
FIG. 8 is a schematic sectional view showing a conventional swirl tank type solid-liquid separator. In the figure, reference numeral 1 denotes a swirl tank type solid-liquid separation tank, and this solid-liquid separation tank 1 is composed of a cylindrical peripheral wall 1a and a tapered tank bottom 1b having the same overall length. Reference numeral 2 denotes a raw water introduction pipe for introducing raw water (treated water) into the solid-liquid separation tank 1, and this raw water introduction pipe 2 is openly connected in a tangential direction to the peripheral wall portion 1 a of the solid-liquid separation tank 1. ing. 3 is an overflow weir disposed in the upper center of the solid-liquid separation tank 1, 4 is a separation water outlet pipe connected to the overflow weir 3, and 5 is connected to the tank bottom 1 b of the solid-liquid separation tank 1. This is a sludge (sedimentable material) discharge pipe.
[0005]
Next, the operation will be described.
The raw water flowing into the solid-liquid separation tank 1 from the raw water introduction pipe 2 is stored up to the height of the overflow weir 3 while turning in the solid-liquid separation tank 1. At this time, the sedimentary substance (SS) contained in the inflowing raw water in the solid-liquid separation tank 1 moves on the swirling flow of the inflowing raw water, and partly overflows to the upflow side. It moves to the underflow side where it is pulled out and is discharged from the sludge discharge pipe 5. By separating and removing the sedimentary substance in this way, the clear water (separated water) rises in the upper part of the solid-liquid separation tank 1, and the clear water flows into the overflow weir 3, It flows out from the separated water outlet pipe 4.
[0006]
Here, the solid-liquid separation by the swirl tank type solid-liquid separation tank 1 as described above will be described in more detail. The separation speed of the solid-liquid separation tank 1 when the horizontal sectional area of the solid-liquid separation tank 1 is S upsilon _L (rising speed of the clarified water sedimentary material in the solid-liquid separation tank 1 is separated) can be obtained by equation (1) by the raw water inflow Q _F with sedimentary material emissions Q _u.
υ _L = (Q _F -Q _u ) / S (1)
[0007]
Therefore, a raw water swirl flow velocity (hereinafter simply referred to as swirl flow velocity) υ _C having a speed higher than the separation speed υ _L is generated in the swirl tank type solid-liquid separation tank 1, and sedimentary substances (fine particles) are generated in the swirl flow. When the particle group) is moved, the sedimentary substance tends to move in the horizontal direction due to the inertial force accompanying the swirling flow, so that it is difficult to transfer to the upward flow at the separation speed υ _L , and the separation speed υ Fine particles having a sedimentation velocity smaller than _L do not rise and move along the swirling flow, and are eventually separated and removed by being extracted from the sedimentary substance discharge pipe 5 as underflow.
[0008]
Therefore, in order to efficiently perform solid-liquid separation by inertia force using the swirling flow of inflow raw water, the following conditions must be satisfied.
(1) Increase the swirling flow velocity υ _C of the incoming raw water.
(2) Separation speed υ Reduce _L.
(3) Reduce the disturbance of the swirling flow and the rising flow as much as possible and clearly distinguish the swirling flow and the rising flow.
{Circle around (4)} The fine particles near the boundary between the swirling flow and the rising flow of the inflowing raw water are quickly caused to flow downward to be under the influence of the swirling flow.
(5) Extract fine particles smoothly.
[0009]
[Problems to be solved by the invention]
Since the conventional swirl tank type solid-liquid separation apparatus is configured as described above, there are the following problems.
(A) when trying to enlarge the turning velocity upsilon _C inflow raw water, solid-liquid separation efficiency increase rate becomes raw water inflow Q _F is large increases is deteriorated.
(B) When the swirl flow velocity υ _C of the inflowing raw water is increased, the influence reaches the upflow region, the flow (swirl flow and upflow) is disturbed, and the solid-liquid separation efficiency is deteriorated.
(C) Therefore, taking large sedimentary material emissions Q _u abnormally (approximately 50% of raw water inflow Q _F), although separation rate upsilon _L is operating so as to decrease, in this case, lean Actually, sludge is extracted in large quantities and cannot be said to be an efficient solid-liquid separation.
[0010]
The present invention has been made to solve the above-described problems, and can increase the swirling flow velocity υ _{C of the} water to be treated containing the sedimentary substance to keep the separation speed υ _L small. Compared to liquid separation tanks, the separation speed and separation efficiency can be greatly increased, and continuous solids that can be used for large-capacity processing with no chemical injection and no need for mechanical operation means and running costs are extremely low. The purpose is to obtain a liquid separation tank .
[0011]
In addition, the present invention can increase the swirl flow velocity υ _{C of the} water to be treated introduced into the tank simply by changing the horizontal sectional area of the upper tank section and the lower tank section, and the swirl flow can be reliably and smoothly performed. It aims at obtaining the solid-liquid separation tank which can be generated.
[0012]
Furthermore, the present invention provides a solid-liquid separation tank that can reliably and smoothly naturally generate a swirling flow of water to be treated and a downward tornado dragon in the vicinity of the center of the tank, and can reliably improve solid-liquid separation efficiency. The purpose is to obtain.
[0013]
Further, the present invention divides the water willow area and the treated water area of the water to be treated by a porous rectifying plate, and eliminates the influence of mutual flow in the both areas, so that the clear separated water with very little mixing of fine particles is obtained. An object of the present invention is to provide a solid-liquid separation tank capable of efficiently obtaining the above.
[0014]
[Means for Solving the Problems]
The solid-liquid separation tank according to the first aspect of the present invention includes a lower-diameter fluidized portion having a water-to-be-treated introduction means for introducing the water to be treated containing a sedimentary substance and a sedimentary substance discharge means for discharging the sedimentary substance. And an upper wide-diameter separation portion having treated water deriving means for deriving treated water from which the sedimentary substance has been separated, and a porous rectifier provided on the upper end surface of the lower narrow-diameter fluidized portion or a horizontal cross section located above the upper end surface In the solid- liquid separation tank provided with a plate, the water to be treated introduction means comprises an introduction port or an introduction pipe provided in the lower narrow-diameter flow section that forms a swirling flow that circulates in the horizontal direction around the lower narrow-diameter flow section. , on the lower surface of the porous rectifying plate, and is characterized in that one or two more guide plate for converting a swirl flow in the lower narrow-diameter moving part to downflow is provided.
[0017]
The solid-liquid separation tank according to the invention described in claim 2 is characterized in that a water stop means is provided at the guide plate installation position of the porous rectifying plate .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1 is a cross-sectional view showing a solid-liquid separation tank according to Embodiment 1 of the present invention. FIG. 2 is a plan view of FIG. 1, and the same or corresponding parts as in FIG. To do. In the figure, 11a is an upper wide-diameter separation part of the solid-liquid separation tank 1, and this upper wide-diameter separation part 11a is formed in a cylindrical shape having the largest horizontal sectional area (diameter) in the entire solid-liquid separation tank 1. ing. 11b is an intermediate tank part formed continuously at the lower end of the upper wide-diameter separating part 11a. The intermediate tank part 11b has the same upper end diameter as the upper wide-diameter separating part 11a, and the lower end side gradually becomes smaller. It is formed in a tapered cylindrical shape. 11c is a lower narrow-diameter flow part formed continuously at the lower end of the intermediate tank part 11b, and the lower narrow-diameter flow part 11c is formed in a cylindrical shape having the same diameter as the lower end diameter of the intermediate tank part 11b. Has a tapered tank bottom 11d.
[0019]
That is, in the solid-liquid separation tank 1 according to the first embodiment, the upper tank part is formed as the upper wide-diameter separation part 11a, the intermediate tank part 11b is formed in a tapered cylindrical shape whose lower end side is gradually reduced in diameter, and The lower tank part is formed as a lower narrow-diameter fluid part 11c continuous with the small-diameter end of the intermediate tank part 11b, and the tank bottom part 11d of the lower narrow-diameter fluid part 11c is formed in a tapered shape whose lower end side gradually becomes smaller in diameter. is there.
[0020]
Reference numeral 12 denotes an inlet provided in the peripheral wall portion of the lower narrow-diameter flow portion 11c and opening in a tangential direction of the peripheral wall portion to introduce water to be treated containing a sedimentary substance. Is connected. Therefore, the introduction pipe 2 and the introduction port 12 introduce the treated water containing the sedimentary substance along the inner wall of the lower narrow-diameter fluid part 11c, and the treated water is introduced into the lower narrow-diameter fluid part 11c. The treated water introducing means is configured to generate a swirling flow by circulating in the horizontal direction. The introduction port 12 may be a raw water discharge end of the introduction pipe 2 itself.
[0021]
Reference numeral 13 denotes an overflow basin provided on the outer periphery of the upper caliber separation portion 11a. A separation water outlet pipe 4 is connected to the overflow basin 13, and the separated water outlet pipe 4 and the overflow basin 13 are connected to each other. The treated water derivation means is constituted by the above. 14 is a horizontal porous rectifying plate provided at the boundary between the upper wide-diameter separating portion 11a and the intermediate tank portion 11b. As the porous rectifying plate 14, a metal net, punching metal, expanded metal, filling A porous member such as a layer is used.
[0022]
Reference numeral 14a denotes a non-porous portion (water stop means) provided at the center of the porous rectifying plate 14, and 15 denotes a guide plate provided on the lower surface of the non-porous portion 14a. The guide plate 15 efficiently converts the swirl flow formed in the lower narrow-diameter flow portion 11c into a downward tornado flow at the center of the tank. One or two (four in the drawing) are provided. It consists of a blade-like plate material. In addition, the sludge discharge pipe (sedimentable substance discharge means) 5 of the solid-liquid separation tank 1 according to the first embodiment is connected to the central part of the tank bottom part 11d having a tapered shape of the lower narrow diameter flow part 11c. .
[0023]
Next, the operation will be described. FIG. 3 is a diagram for explaining the operation.
When raw water (treated water containing sedimentary substances) flows from the introduction pipe 2 into the lower narrow-diameter fluid portion 11c of the solid-liquid separation tank 1, the incoming raw water enters the inner peripheral surface of the lower narrow-diameter fluid portion 11c. Along the horizontal direction. Accordingly, a swirling flow A is generated in the raw water flowing into the lower narrow diameter fluidized portion 11c, and the inflowing raw water is continuously introduced while swirling and stored up to the height of the upper wide diameter separating portion 11a.
[0024]
Here, the swirl flow A formed inside the lower narrow-diameter flow portion 11c and the intermediate tank portion 11b is changed to a downward tornado flow (axial flow) B by the guide plate 15 provided on the porous rectifying plate 14. To do. And the fine particle group which is a sedimentation substance (solid phase) in raw | natural water is separated from raw | natural water by being involved in the tornado flow B and moving downward. On the other hand, since the influence of the swirl flow A is prevented by the porous rectifying plate 14 in the upper wide-diameter separation part 11a, the uniform upward flow C is obtained, and the separated water from which the sedimentary substance is separated can rise uniformly.
[0025]
That is, in the lower narrow-diameter flow part 11c and the intermediate tank part 11b of the solid-liquid separation tank 1, since the fine particle group in the inflow raw water is moving on the swirl flow A, it gives a strong inertial force in the horizontal direction. It becomes difficult to move to the upward flow C side and moves in the horizontal direction. In this state, the swirl flow A of the inflowing raw water is changed to the downward tornado flow B by the guide plate 15, so that the fine particles moving in the horizontal direction as described above are smoothly wound into the downward tornado flow, It is separated from the raw water and moves downward to be discharged from the sludge discharge pipe 5 at the bottom of the tank.
[0026]
Therefore, the fine particle group in the inflowing raw water is easily separated from the separated water (water phase) that flows through the porous rectifying plate 14 to the upper wide-diameter separating portion 11 a located above the porous rectifying plate 14. For this reason, solid-liquid separation can be efficiently performed in a short time compared with general gravity precipitation. The separated water that has passed through the porous rectifying plate 14 and transferred to the upper wide-diameter separating portion 11a flows over the upper end of the peripheral wall of the upper wide-diameter separating portion 11a by continuously introducing raw water. After flowing into the tub 13, it is led out from the separated water lead-out pipe 4 as treated water lead-out means.
[0027]
According to the first embodiment described above, the upper tank area of the solid-liquid separation tank 1 is formed as the upper wide-diameter separation portion 11a having a large horizontal cross-sectional area, and the lower tank area of the solid-liquid separation tank 1 is horizontal. The lower narrow-diameter flow portion 11c having a small cross-sectional area is formed, and the raw water (containing sedimentary substances is included) in the lower narrow-diameter flow portion 11c in the horizontal direction along the inner peripheral surface of the lower narrow-diameter flow portion 11c. In the lower narrow-diameter flow portion 11c having a small horizontal cross-sectional area, the swirl flow A having a high swirl flow velocity υ _{C of the} inflow raw water can be formed and maintained, and it is possible to slow the rate of separation upsilon _L in upper wide diameter separator unit 11a, there is an effect that the solid-liquid separation efficiency is improved.
[0028]
Further, according to the first embodiment, a tapered intermediate tank portion 11b whose lower end side has a gradually smaller diameter is continuously formed between the upper wide diameter separating portion 11a and the lower narrow diameter flow portion 11c. Since it comprised, there exists an effect that the inflow raw | natural water can be smoothly circulated from the said lower narrow diameter flow part 11c toward the upper wide diameter separation part 11a by the taper-shaped intermediate tank part 11b.
[0029]
Furthermore, according to the first embodiment, the porous rectifying plate 14 is provided at the boundary between the upper wide-diameter separating portion 11a and the intermediate tank portion 11b. The swirling flow A from the flow part 11c does not affect the flow of the separation water rising in the upper wide-diameter separation part 11a, and there is an effect that solid-liquid separation can be performed smoothly and efficiently.
[0030]
Furthermore, according to the first embodiment, the guide plate 15 is provided on the lower surface of the non-hole portion 14a provided at the center of the porous rectifying plate 14, and the guide plate 15 causes the swirling flow A of the inflowing raw water to face downward. The tornado flow B is changed so that a group of fine particles, which are sedimentary substances in the inflowing raw water, can be involved in the tornado flow B and moved downward. Since the group is easily separated from the raw water and can be prevented from flowing out to the upper wide-diameter separation part 11a located above the porous rectifying plate 14, there is an effect that the solid-liquid separation can be efficiently performed in a short time.
[0031]
As described above, according to the first embodiment, the solid-liquid separation efficiency can be increased, and no continuous operation can be performed at a low running cost and corresponding to a large-capacity process without requiring any chemical operation means without chemical injection. There is an effect that a liquid separation tank can be provided.
[0032]
Embodiment 2. FIG.
4 is a cross-sectional view showing a solid-liquid separation tank according to Embodiment 2 of the present invention. The same or corresponding parts as those in FIGS. 1 to 3 and FIG. In FIG. 4, reference numeral 16 denotes an inclined plate for promoting the separation and clarification, which is accommodated in the upper wide-diameter separation portion 11 a of the solid-liquid separation tank 1.
[0033]
FIG. 5A to FIG. 5E are perspective views showing various modified examples of the inclined plate 16. The inclined plate 16 shown in FIG. 5 (a) is composed of parallel plates arranged at a constant parallel interval in the upper wide-diameter separating portion 11a, and the inclined plate 16 shown in FIG. 5 (b) is similarly arranged. 5 (c), the inclined plate 16 of FIG. 5 (c) is composed of a rectangular sedimentation pipe partitioned into a plurality of parallel water passages, and the inclined plate 16 of FIG. 5 (d) has a plurality of round pipes. The inclined plate 16 in FIG. 5 (e) is formed by packing a filler such as a Raschig ring with a water-soluble member, and the upper wide-diameter separating portion 11a is selected by selecting one of the inclined plates 16. It is stored and arranged inside.
[0034]
The inclined plate 16 is not limited to that shown in FIGS. 5 (a) to 5 (e). For example, a short tube, a granite, a granular carrier, or the like may be used as a filler. In short, any member may be used as long as it is a separation water clarification promoting member capable of promoting clarification of separated water in the upper wide-diameter separation portion 11a.
[0035]
According to the second embodiment described above, since the inclined plate 16 is housed and arranged inside the upper wide-diameter separation portion 11a of the solid-liquid separation tank 1 according to the first embodiment, the upper wide-diameter separation is performed. There is an effect that the clarification degree of the separated water that has flowed up into the portion 11a can be further improved by the inclined plate 16 to improve the quality of the treated water.
[0036]
Embodiment 3 FIG.
6 is a cross-sectional view showing a solid-liquid separation tank according to Embodiment 3 of the present invention. In the third embodiment, in the solid-liquid separation tank 1 according to the first embodiment, the intermediate tank portion 11b is not provided, and the upper wide-diameter separation portion 11a has a horizontal sectional area larger than that of the upper wide-diameter separation portion 11a. The small lower-diameter flow part 11c is continuously formed, and the same effects as those in the first embodiment can be obtained even in the solid-liquid separation tank 1 having such a configuration. In addition, the same code | symbol is attached | subjected to the same or equivalent part as the said Embodiment 1 in this Embodiment 3, and duplication description is abbreviate | omitted.
[0037]
Embodiment 4 FIG.
FIG. 7 is a cross-sectional view showing a solid-liquid separation tank according to Embodiment 4 of the present invention. The same or corresponding parts as those in Embodiments 1 to 3 are given the same reference numerals, and redundant description is omitted. To do. In this Embodiment 4, the whole tank of the solid-liquid separation tank 1 is formed in a hopper shape in which the lower end side is gradually reduced in diameter, and is formed on the upper end surface of the lower narrow diameter flow portion 11c (that is, the lower end surface of the upper wide diameter separation portion 11a). A porous rectifying plate 14 is disposed, an upper tank area of the porous rectifying plate 14 is an upper wide diameter separating portion 11a, a lower tank area of the porous rectifying plate 14 is a lower narrow diameter flowing portion 11c, and the porous rectifying plate 14 The guide plate 15 is provided on the lower surface of the non-hole portion 14a. Even in the case of the solid-liquid separation tank 1 having such a configuration, the same effects as those of the first embodiment can be obtained.
[0038]
In each of the above-described embodiments, the installation site of the guide plate 15 in the porous rectifying plate 14 is the non-hole portion 14a. The guide plate 15 may be supported by a water plate. In short, the porous rectifying plate 14 is provided with a water stopping means for preventing the upward upward flow in the reverse direction when the swirling flow in the lower narrow diameter flow portion 11c is converted into the downward tornado flow by the guide plate 15. It only has to have.
[0039]
Further, in the first to third embodiments, a sludge scraper that is rotated by a motor (not shown) is provided on the tank bottom 11d side in the lower narrow-diameter flow part 11c of the solid-liquid separation tank 1. It may be provided. In this case, the sludge scraper scrapes the separated sedimentary substance to the central portion of the tank bottom 11d (the introduction side opening of the sedimentary substance discharge pipe 5) and quickly discharges it from the sedimentary substance discharge pipe 5. It is possible to improve the solid-liquid separation efficiency.
[0040]
Moreover, in the said Embodiment 1 to the said Embodiment 4, you may provide the scum removal apparatus (not shown) located in the water surface vicinity in the upper wide diameter separation part 11a of the solid-liquid separation tank 1. FIG. In this case, since the scum that floats on the water surface of the upper wide-diameter separating portion 11a can be discharged by the scum removing device, there is an effect that the clarification of the separated water is further increased.
[0041]
Further, in the first to fourth embodiments, the inflow raw water in the system of the introduction pipe 2 contains an inorganic flocculant, a polymer flocculant, a PH regulator, and a sedimentation promoting substance such as sand. You may make it add as needed. When the chemical and sedimentation promoting substance are added to the inflow raw water, the water to be treated is flown by the swirling flow and the downward tornado flow in the lower narrow-diameter flow section 11c without providing a special chemical mixing tank or the like. Additives can be mixed efficiently.
[0042]
As described above, according to this invention, deriving treated water deriving a lower narrow diameter flow moving parts having a beauty sedimentation material discharge means Oyo treatment water introduction means, the treated water sedimentary material is separated An upper wide-diameter separating portion having means, and a porous rectifying plate provided on the upper end surface of the lower narrow-diameter flow portion or a horizontal cross section located above the upper end surface, and as the treated water introducing means, An inlet or an introduction pipe for forming a swirling flow that circulates in the horizontal direction in the lower narrow-diameter flow section is provided in the lower narrow-diameter flow section, and the lower surface of the porous rectifying plate is provided in the lower narrow-diameter flow section. Since one or more guide plates for converting the swirl flow into the downward flow are provided, the following special effects are achieved.
That is, since the water to be treated is directly introduced into the lower narrow-diameter fluid part from the introduction port or introduction pipe provided in the lower narrow-diameter fluid part having a small horizontal cross-sectional area as compared with the upper wide-diameter separation part, In the narrow diameter flow section, the swirl flow rate of the water to be treated is fast, and in the upper wide diameter separation section, the separation speed can be slowed down so that solid-liquid separation can be performed efficiently. In the upper wide-diameter separation part, the swirling flow of the inflowing raw water generated in the upper wide-diameter separation part can be prevented from adversely affecting the upward flow of the separation water rising in the upper wide-diameter separation part. A high degree of separation water can be obtained, and the swirling flow of the water to be treated generated in the lower narrow-diameter flow part can be converted into a downward tornado flow by the guide plate provided on the lower surface of the porous rectifying plate. In the to-be-treated water For involving the descending material can be moved downwardly, there is an effect that it is possible to perform more efficiently the solid-liquid separation.
[0043]
Further, according to this invention, since it is configured to provide a porous rectifying plate in the horizontal plane positioned above the upper end surface or the upper end surface of the lower narrow-diameter moving part, generated within the lower narrow-diameter moving part swirling flow of the inflow raw water, such adverse effect on the upward flow of separated water to rise in the upper wide diameter separating portion does not reach, the swirling flow can be blocked by a porous rectifying plate, therefore, the upper wide diameter separator unit Then, there is an effect that separated water with high clarity can be obtained.
[0044]
Furthermore, according to this invention, as described above, said inlet or inlet pipe to form a swirling flow circulates in the horizontal direction on the lower narrow diameter flow moving parts as the treatment water introduction means lower Sema径Since it is configured to be provided in the fluidized portion, it is possible to reliably and smoothly generate the swirling flow of the water to be treated in the lower narrow diameter fluidizing portion, and the swirling flow causes the sedimentary substance in the water to be treated in the horizontal direction. A large inertia force can be applied, and there is an effect that the inertia force separation can be performed efficiently.
[0045]
Furthermore, according to this invention, as described above, as the lower surface of the porous rectifying plate is provided with a one or two more guide plate for converting a swirl flow in the lower narrow-diameter moving part to downward flow since it is configured, the swirling flow of the treated water generated in the lower narrow-diameter moving portion, the guide can be converted into downward tornado flow by plate, involving precipitation material to be treated in water at its tornado flow Therefore, there is an effect that the solid-liquid separation can be performed efficiently.
[0046]
Furthermore, according to this invention, since there is provided a water stop means on the guide plate installation position of the perforated rectifier plate, when the swirling flow in the lower narrow-diameter moving part is converted into a downward tornado flow collides with the guide plate In addition, it is possible to prevent the upward flow in the opposite direction from occurring, and for this reason, the upper wide-diameter separation portion has an effect that it is possible to obtain separated water having a high degree of clarity.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a solid-liquid separation tank according to Embodiment 1 of the present invention.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is an operation explanatory diagram of the solid-liquid separation tank according to Embodiment 1 of the present invention.
FIG. 4 is a sectional view showing a solid-liquid separation tank according to Embodiment 2 of the present invention.
5 is a perspective view showing various modified examples of the inclined plate in FIG. 4. FIG.
FIG. 6 is a sectional view showing a solid-liquid separation tank according to Embodiment 3 of the present invention.
FIG. 7 is a sectional view showing a solid-liquid separation tank according to Embodiment 4 of the present invention.
FIG. 8 is a schematic cross-sectional view showing a conventional swirl tank type solid-liquid separation tank.
[Explanation of symbols]
1 Solid-liquid separation tank 2 Introducing pipe (treated water introducing means)
4 Separation water outlet pipe (treated water outlet)
5 Sludge discharge pipe (means for discharging sedimentary substances)
11a Upper wide diameter separation part 11b Intermediate tank part 11c Lower narrow diameter flow part 11d Tank bottom part 12 Inlet (treated water introduction means)
13 Overflow water (means for deriving treated water)
14 Porous flow regulating plate 14a Non-hole part (water stop means)
15 Guide plate 16 Inclined plate

Claims (2)

A lower-narrow-diameter flow section having treated water introduction means for introducing treated water containing a sedimentable substance and a sedimentable substance discharge means for discharging sedimentary substances;
An upper wide-diameter separation unit having treated water deriving means for deriving treated water from which sedimentation substances have been separated;
In a solid- liquid separation tank provided with an upper end surface of a lower narrow diameter fluidized portion or a porous rectifying plate provided in a horizontal section located above the upper end surface ,
The treated water introduction means is an introduction port or an introduction pipe provided in the lower narrow-diameter flow section that forms a swirling flow that circulates in the horizontal direction in the lower narrow-diameter flow section,
One or more guide plates for converting the swirling flow in the lower narrow-diameter flow portion into a downward flow are provided on the lower surface of the porous rectifying plate.
A solid-liquid separation tank characterized by that. The guide plate installation position of the perforated rectifier plate is solid-liquid separation tank according to claim 1 Symbol mounting, characterized in that the water stop means.

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